All venues:
Highlight the "My Corner" option at the main menu, then press Left(3), Right(3),
Left, Right(2). A sound will confirm correct code entry.
Big head mode:
Highlight the "Fight Now" option at the main menu, then press Left, Right, Left,
Right, Left, Right, Left. A sound will confirm correct code entry. Select the
"Fight Now" option to have a big headed boxer.
Fight as Big Tigger:
To unlock Big Tigger as a boxer, go to the main menu. Select "My Corner", then
"Record Books", then "Most Wins-Boxer". Tap Up(2) and you will now be able to
play as Big Tigger as a middleweight fighter. A sound will confirm correct code
entry.
Sites: